"Escape-A", for example, is

    send \033A

"Control-c", for example, is

    send \003

http://expect.nist.gov/FAQ.html#q53 http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?ASCII+character+table

See also "How Expect sees function keys".

Helmut Giese mentions that "[t]o go from an arbitrary ASCII character (say X) to its 'control' code (Ctrl X) just do

    set ctrl [expr ($char & 01xF)]

"

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Category Expect