Try these curated collections

Simple Set of Engineering Related Color Vector Line Icons. 
Contains such Icons as Calculations, Blueprint, Engineer, App Design and more. 
Editable Stroke. 64x64 Pixel Perfect.
Engineering People Vector Line Icons Set
Simple Set of Setup and Settings Related Vector Line Icons. 
Contains such Icons as Installation Wizard, Download, Restore Options and more. Editable Stroke. 48x48 Pixel Perfect.
Settings and Tools Icons. Vector set style: bicolor flat images, orange and gray colors, isolated on a white background.
Modern thin line icons set of production management, project quality control. Premium quality outline symbol collection. Simple mono linear pictogram pack. Stroke vector logo concept for web graphics.
Artificial intelligence system icons set. Outline set of artificial intelligence system vector icons for web design isolated on white background
Engineering and manufacturing vector icon set
Modern thin line icons set of data science technology, machine learning process. Premium quality outline symbol collection. Simple mono linear pictogram pack. Stroke vector logo concept, web graphics.
Information Technology concept icon
Computer engineering
Big set of icons of automatic and manual production. Outline symbols of business, modern machinery equipment concept. Editable Stroke.
Male IT Specialist Holds Laptop and Discusses Work with Female Server Technician. They're Standing in Data Center, Rack Server Cabinet with Cloud Server Icon and Visualization.
Chip computer. Engineering electronic micro scheme computer system board vector icon set
Simple Set of Engineering Related Vector Line Icons. Contains such Icons as Calculations, Blueprint, Engineer, App Design and more.
Modern contour icons database processing methods of data.  Data science technology, machine learning process. Data insight, transformation, scalable, modeling API, pattern system.
System Integration Vector Line Icon
System administrator flat icons set of server racks and network engineers involved in maintenance of system modules isolated vector illustration
programer and software development coding icons
Manufacturing and Engineering Vector Icons
Options and tools icon set. These bicolor icons use modern corporate light blue and gray colors, white color is not used in the symbols.
Simple Set of Mass Production Related Vector Line Icons. 
Contains such Icons as Industrial Oven, Robot Manipulator, Warehouse, Painting Bot and more.
Editable Stroke. 48x48 Pixel Perfect.
Simple Set of Engineering Flat Line Icons. Contains such Symbols as Manufacturing, Technology, Engineer, Team, Solutions, Service and more.
Set of circuit tech elements. Electronics icon. Tech logo.
Modern thin line icons set of future technology and artificial intelligent robot. Premium quality outline symbol collection. Simple mono linear pictogram pack. Stroke vector logo concept, web graphics
Service vector icon and 1600 other business, service tools, medical care, software toolbar, web interface pictograms. Style is bicolor flat symbols, eco green and gray colors, rounded angles, white
Development icon with bonus love symbols. Vector illustration style is flat iconic blue and gray symbols on white background.
Computer chip technology vector icon
Coffee maker, Seo and World globe line icons set. Swipe up, Unlock system and Engineering signs. Tea machine, Search target, Around the world. Scrolling page. Business set. Vector
energy and industry icons set, go green icons
System of technical support. People interacting with the technical support center. Modern vector illustration isometric style.
Simple Set of Abstract Electronics Related Vector Line Icons. 
Contains such Icons as Spider Bot, Chip, Circuit, Abstract Electronic Module and more.
Editable Stroke. 48x48 Pixel Perfect.
SOFTWARE ENGINEERING ICON SET
Simple engineer icons set,Vector
Computer Chips and Electronic Circuit icons  in thin line style

Manager Technical Industrial Engineer working and control robotics with monitoring system software and icon industry network connection on tablet. AI, Artificial Intelligence, Automation robot arm.
Chip processor icon infographic isolated in flat style.Vector illustration.
big data icons set for business and enterprise
Stroke line icons set of agile product management, project workflow process Modern flat linear pictogram concept Premium quality outline symbol collection Simple vector material design of web graphics
Simple engineer icons set,Vector
programming icons, software development icons
Set Of 12 Editable Repair Icons. Includes Symbols Such As Reconstruction, Build Equipment, Cogwheels And More. Can Be Used For Web, Mobile, UI And Infographic Design.
Engineering icons. ideas, rulers, calculators, hat icons and more. Eps10 vector
Business Analysis concept icons,Blue version,vector
Vector illustration of modern icon
car service icons set, automotive, car production, car parts, car wash icons, vector set
smart house device smartphone with app icons on tablet pc
human settings icon vector
Vector illustration of an organization system, strategy concept. Cog-wheels and gears placed in a circle, service icon. Business and manufacturing process theme.
Service Tools icon. Vector pictogram style is a flat bicolor symbol, soft blue colors, chess transparent background. Designed for software and web interface toolbars and menus.
Transmission Wheels Rotation pictograph with bonus quad copter tools pictograms. Vector illustration style is flat iconic symbols on white background.
Computer Chips icons,Vector
Business network concept. Human Resources. Group of businesspeople.
Thin line icons set of renovation, improvement and repair. Outline symbol collection. Editable vector stroke. 64x64 Pixel Perfect.
industry, energy and construction icons set, industrial and engineering detail buttons

Manager engineer analyzing and control automation robot arms machine on software modern virtual interface data real time  in intelligent factory industrial and digital manufacturing operation.
Digital technologies. Monitoring and testing of the digital process. Digital business analysis. Conceptual illustration. Isometric vector illustration. 3D
Set Of 16 Robotics Icons. Includes Cyborg, Related Information, Hive Pattern And Other Symbols. Beautiful Design Elements.
Line icon-   hand and  gear
9 engineering filled icons set isolated on white background. Icons set with Systems Integration, cogwheel, Artificial Intelligence, Compasses, Repair service, bulldozer icons.
Student Degree in Information Technology Stick Figure Pictogram Icon
The blue speech bubble with the setting symbol / the glossy bubble with cogwheel icon / the cogwheel icon
Data engineering banner web icon for business and organization. Data lake, big data, process, classification, database, data analytic and evaluation. Minimal vector infographic.
Simple Set of Electronics Related Color Vector Line Icons. 
Contains such Icons as CPU, Artificial Intelligence, Sim Card and more. 
Editable Stroke. 64x64 Pixel Perfect.
Linear icon set of Data science technology and machine learning process. Material design icon suitable for print, website and presentation
Line icon-   hand and  gear

Search for "systems engineering icons" in these categories

Simple Set of Engineering Flat Line Icons. Contains such Symbols as Manufacturing, Technology, Engineer, Team, Solutions, Service and more.
Gears icon from Commerce Set. Vector style: bicolor flat symbol, smooth blue colors, rounded angles, white background.
Tools icon. Vector style is flat iconic symbol with rounded angles, black color, light gray background.
System and network administration landing page website template. Vector illustration of IT professionals, engineers. Server maintenance, network management, computer systems administration.
IoT (Internet of Things) concept. Communication network.
Service vector icon and 1600 other business, service tools, medical care, software toolbar, web interface pictograms. Style is bicolor flat symbols, blue and gray colors, rounded angles, white
Vector illustration of an organization system, strategy concept. Cog-wheels and gears placed in a circle, service icon. Business and manufacturing process theme.
Communication network concept. IoT (Internet of Things). Telecommunication.
Set of colorful profession people flat style icons in circles with long shadows vector illustration
Simple engineer icons set,Vector
chip isolated minimal icon. processor line vector icon for websites and mobile minimalistic flat design.
Set of Future technology icons. Abstract design elements.
Automation concept as an innovation, improving productivity, reliability and repeatability in technology and business processes.
Production line icons. Industry machine production, factory conveyor line, automatic robot manipulator. Industrial vector pictograms template concept engineering set
Set line icons of engineering isolated on white. Caliper, engineer, calculating, robotic industry, 3d design, blueprint, cogwheel, circuit board, drawing compass, spanner
chip isolated minimal icon. processor line vector icon for websites and mobile minimalistic flat design.
Civil engineering concept icons set. Resource supply. City infrastructure. Sustainable construction idea thin line RGB color illustrations. Vector isolated outline drawings. Editable stroke
Data engineering outline vector icon. Thin line black data engineering icon, flat vector simple element illustration from editable general concept isolated stroke on white background
Cogwheels in black & white controlled by red gear by hand(person). This graphic vector illustration represents importance of key person(leader) in the team for the balance & smooth functioning
Gears
Editable 25 settings icons for web and mobile. Set of settings included icons line Settings, Configuration, Maintenance, Cloud computing, Wrench, Login, Screwdriver on blue background
Simple Set of Engineering Flat Line Icons. Contains such Symbols as Manufacturing, Technology, Engineer, Team, Solutions, Service and more.
vector circuit board sphere
Automation Software Technology Process System Business concept.
Software development, automation technology, system security upgrade, data processing, machine learning, artificial intelligence, tech support and maintenance, line icon, vector linear illustration
Computer repair services, IT support concept, software development, system administration, desktop upgrade and update, program installation, vector line icon
Engineer hand check and control welding robotics automatic arms icon with machine in intelligent factory automotive industrial with UI monitoring system software.
Industrial technology concept. Communication network. INDUSTRY 4.0. Factory automation.
Double exposure of Engineer with oil refinery industry plant background, industrial instruments in the factory and physical system icons concept
 A simple set of settings and options related to Vector Line Icons. Contains icons such as set time, business, phone, and more. Editable Stroke.. 480x480.
Processor line vector icon for websites and mobile minimalistic flat design.  Mini CPU Icon Flat Style. Mobile CPU Vector. Phone CPU Illustration. Basic CPU Icon. Editable Stoke. EPS 10
Industry 4.0 technology concept - Smart factory for fourth industrial revolution with icon graphic showing automation system by using robots and automated machinery controlled via internet network .
Assembly line art with isolated colored in linear style elements and lines vector illustration
Artificial intelligence Machine Learning Business Internet Technology Concept.
Molecular compound icon. Outline molecular compound vector icon for web design isolated on white background
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