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Flight instrument symbology and vehicle tell-tales — two families read in a glance by someone doing something else, and both encoding urgency in colour rather than in the pictogram. What holds the group together is that most members report something the shape alone does not: a stability-control lamp means opposite things flashing and steady, a glow-plug lamp is an instruction when it goes out and a fault when it does not, a tyre-pressure lamp is a squashed tyre seen from the front and unrecognisable until you are told. Two members record a convention that reverses between traditions, which is a training hazard rather than a curiosity.
A miniature aircraft against a split brown and blue disc.
A miniature aircraft with a ball in a curved tube below.
A dial reading feet per minute up or down from a centre zero.
Coloured arcs around an airspeed dial.
A horizontal needle showing position above or below the approach path.
A car outline above two wavy skid lines.
A battery or arrow display showing energy recovered.
An amber lamp outline with radiating lines and a fault mark.