and 1 show the mnemonic abbreviations (see Glossary for
d e f i n i t i o n of Mnemonic), and the printing symbols for the control
(2) The diamond
is printed to show the detection of an error.
(3) The heart
may be printed to show a character of the control
(4) Columns 2 through 7 show non-printing codes in the 96 symbol