Tidal diamond

Tidal diamonds are symbols on British admiralty charts that indicate the direction and speed of tidal streams.

The symbols consist of a Latin letter in a rhombus, printed in purple ink. On any particular chart each tidal diamond will have a unique letter starting from "A" and continuing alphabetically.

单词	Tidal diamond
释义	Tidal diamond 英语百科 Tidal diamond Tidal diamonds are symbols on British admiralty charts that indicate the direction and speed of tidal streams. The symbols consist of a Latin letter in a rhombus, printed in purple ink. On any particular chart each tidal diamond will have a unique letter starting from "A" and continuing alphabetically.
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