I have made a third stencil of military (NATO) symbols to use for my wargames maps and orders of battle. I created it by scanning the symbo…

Military Symbols III

UML2 Activity Diagrams

VanHoff-UML-Activity

Causal Loop Diagram Elements and Archetypes

Causal Loop Diagrams

UML2 State diagram

VanHoff-UML-State

Some Icons for Finite State Machines

Finite State Machine

This is a non-standard extension to IDEF1X97 (ISO/IEC/IEEE 31320:2) to help you design spatial Relational databases (e.g., to be implemente…

IDEF1X97 - A Spatial Ext…

Some nice hand drawn style flowchart symbols

Hand drawn flowchart

Sparkfun Espressif ESP32 Arduino

Sparkfun ESP32 Thing

generic system block diagram symbols for wireless equipment, based on 2020 USITT Sound Document Recommendations v3

SBD Wireless v1