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Approach lighting, the aerodrome sign colour grammar, aeronautical chart symbology, airspace boundaries and the coded language of flight. Aviation is the most internationally standardised domain in this catalogue — ICAO Annexes 4 and 14 govern charts and aerodromes worldwide — so members name the Annex rather than a country, and name a country only where national practice departs from it. The colour grammar is the group's transferable rule: red means an instruction that may not be crossed, black on yellow says where you are, yellow on black says where a turn leads.
Paired bars beside the runway centreline counting distance.
Two broad rectangles where the approach path meets the runway.
Arrows leading to a threshold set back from the paved end.
Yellow chevrons over pavement that must not be used.
Four lights showing whether an approach is high or low.
White lettering on red, marking a boundary not to be crossed.
Yellow lettering on black, naming where you are.
A rotating light whose colours identify the field type.
A hexagon with a compass rose marking a radio navigation aid.
Tinted bands and figures giving a volume's ceiling and floor.
A tower shape with heights above ground and above sea level.
A three-figure altitude flown on a standard pressure setting.
Two altimeter settings measuring from different datums.
A four-digit octal code identifying an aircraft to radar.
A national prefix and a unique identifier painted on the airframe.
Twenty-six words standing for letters over a radio.
A dashed line joining points of equal magnetic variation.
A side elevation showing altitudes along a final approach.
A letter H within a circle or a square touchdown area.
A coded notice of a temporary hazard or change.
A letter grading the wake an aircraft leaves behind it.