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FOCAL (programming language)
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=== Variables === Variable names may start with any letter except F (F is reserved for functions) and may contain any sequence of letters and numbers. However, only the first two characters are significant. For example, the following code sample from ''FOCAL: A New Conversational Language''<ref>{{cite book |title=FOCAL: A New Conversational Language |url=http://www.cs.uiowa.edu/~jones/pdp8/focal/focal69.html |publisher=Digital}}</ref> refers to the same variable as DESTINATION and then DES. Internally, both references refer to a variable designated DE: 01.80 ASK DESTINATION 02.30 IF (DES-14) 2.4,3.1,2.4 Any variable may be treated as an array, allowing subscripts from -2048 through 2047.[http://www.pdp8.net/lang/focal/misc.shtml]
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