Symbol 5312 from IEC 60417 - Title/Meaning: Frame alignment Function/description: To indicate frame alignment.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/20a03eed-1d40-42de-8f9e-dc046a3a3c96 200.png
Vectorization:  Mrmw