Revision as of 05:53, 15 January 2022 edit Lotje (talk \| contribs) Extended confirmed users, File movers, Pending changes reviewers, Rollbackers 142,818 edits (red) wikilink ← Previous edit		Revision as of 11:53, 19 January 2022 edit undo Jchaney44145 (talk \| contribs) 5 edits →Design: Removed inaccurate information about Morse code. The sentence continued with “or sending two different tones”. Morse code doesn’t use two tones, it uses one of precise timing. Tags: Mobile edit Mobile web edit Next edit →
Line 45: Because of the difficulty and length of time required for specifying a single letter, prisoners often devise abbreviations and acronyms for common items or phrases, such as "GN" for ''Good night'', or "GBU" for ''God bless you''.<ref name="pbs"/> By comparison, [[Morse code]] is harder to send by tapping or banging because it requires the ability either to create taps with a clear and precise rhythm ~~or to produce two different-sounding noises~~. Morse code also takes longer to learn. Learning the tap system simply requires one to know the alphabet and the short sequence "AFLQV" (the initial letter of each row), without memorising the entire grid. For example, if a person hears four knocks, they can think "A... F... L... Q". If after a pause there are three knocks, they think "Q... R... S" to arrive at the letter S. == History ==

Tap code: Difference between revisions