Symbol 5316 from IEC 60417 - Title/Meaning: Three-level signal Function/description: To indicate a three-level signal, for example a bipolar signal.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/6e958ade-ef3c-4f47-8c43-01794bb398cc 200.png
Vectorization:  Mrmw