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===Underscored alphabetic characters===
Missing from Unicode are the traditional [[underlining|underscored]] alphabetic characters included in some of the APL code pages; their usage has been eliminated or deprecated in most APL implementations. These were produced on APL printing terminals by over-striking a straight capital letter with an underscore character.
IBM assigns them GCGIDs as "LA480000" (which they name "A Line Below Capital/A Underscore (APL)"), "LB480000" ("B Line Below Capital/B Underscore (APL)") and so forth, under the "L" series used for Latin letters.<ref name="cs963" /> The use of an even number (48) rather than an odd number (47) is due to being uppercase: compare the use of SD110000 for a lone acute accent {{code|´}}, LA110000 for the lowercase {{code|á}}, and LA120000 for the uppercase {{code|Á}}.<ref name="cp1252">{{cite web |url=ftp://ftp.software.ibm.com/software/globalization/gcoc/attachments/CP01252.txt |title=Windows, Latin 1 |id=CPGID 01252 |publisher=[[IBM]]}}</ref>
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* {{unichar|1E94|LATIN CAPITAL LETTER Z WITH LINE BELOW}}
However, this does not cover the entire [[ISO basic Latin alphabet]], and IBM's reference glyphs for the APL characters show them both underlined and [[oblique type|oblique]]
* {{unichar|0331|COMBINING MACRON BELOW|cwith=◌}}
* {{unichar|0332|COMBINING LOW LINE|cwith=◌}}
==Keyboard layout==
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