From Stu (G3OCR) on the Wouxun KG-UVD1 Yahoo Group gives a repeater primer on the various burps/chirps/tones/beeps/dits/dahs/buzzes you might hear:
"The tone is commonly referred to as a "K" tone, because all repeaters used to be programmed to send a Morse __ _ __ (letter K, the Morse code abbreviation for "over to you") to let you know that the other station had finished transmission and the time-out timer had been reset. A lot of repeaters these days use a letter T (one dash) instead, but there are other variants too.
Other tones used sometimes are an "access tone", which is a bit of history as a 1750 tone-burst used to be (and sometimes still is) required by the repeater at the start of a transmission to stop unmodulated carriers opening the repeater and possibly keeping it open.
The 118Hz tone you refer to is called a CTCSS (Continuous Tone Coded Squelch System), sometimes called a PL-Tone in other countries like USA. This can be one of a number of low-audio tones (sub-audible) and these are usually chosen to avoid a station inadvertently opening up a repeater half a state away as well as your local one, if there's a "lift".
So there you have (wanted or not!) a quick rundown on the terms for the different tones relating to repeaters."
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