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Triangles and bars for play, pause, stop and skip.
Also known as: Play pause symbols, Media controls
The transport controls — a triangle for play, two bars for pause, a square for stop, doubled triangles for skip — come from tape machine controls of the 1960s and were standardised by IEC in 1973. They now appear on devices with no moving parts at all.
Control playback: a right-pointing triangle for play, two upright bars for pause, a square for stop and doubled triangles for search or skip.
Contexts: Electrical equipment
Were designed for tape transports and standardised by the IEC in the early 1970s, and survive on devices that have no transport to control.
Contexts: Electrical equipment
Simple shapes in a row: a solid triangle pointing right, two upright bars, a filled square and paired triangles.