위첨자, 아래첨자

!e : 위 첨자 사용시 사용
!d : 아래첨자 사용시 사용
!n : 원래 상태로(위첨자, 아래첨자가 아닌) 돌릴 때 사용
!x : 폰트를 원래 상태로 돌릴 때 사용..

이 세 가지를 조합해서 표시하면 됨.. 

p.s 1. Angstrom은 '!6!sA!r!u!9 %!6!n'

         이걸로 표시가 되긴 하지만, 완전하지는 않다.

p.s 2. !와 관련된 명령어는 아래의 테이블 정도이면 충분할듯 싶다.

Table H-33: Embedded Font Selection Commands

Command	Hershey Vector Font	TrueType Font	PostScript Font
!3	Simplex Roman (default)	Helvetica	Helvetica
!4	Simplex Greek	Helvetica Bold	Helvetica Bold
!5	Duplex Roman	Helvetica Italic	Helvetica Narrow
!6	Complex Roman	Helvetica Bold Italic	Helvetica Narrow Bold Oblique
!7	Complex Greek	Times	Times Roman
!8	Complex Italic	Times Italic	Times Bold Italic
!9	Math/special characters	Symbol	Symbol
!M	Math/special characters (change effective for one character only)	Symbol	Symbol
!10	Special characters	Symbol *	Zapf Dingbats
!11(!G)	Gothic English	Courier	Courier
!12(!W)	Simplex Script	Courier Italic	Courier Oblique
!13	Complex Script	Courier Bold	Palatino
!14	Gothic Italian	Courier Bold Italic	Palatino Italic
!15	Gothic German	Times Bold	Palatino Bold
!16	Cyrillic	Times Bold Italic	Palatino Bold Italic
!17	Triplex Roman	Helvetica *	Avant Garde Book
!18	Triplex Italic	Helvetica *	New Century Schoolbook
!19		Helvetica *	New Century Schoolbook Bold
!20	Miscellaneous	Helvetica *	Undefined User Font
!X	Revert to the entry font	Revert to the entry font	Revert to the entry font

Table H-34: Vector-Drawn Positioning and Miscellaneous Commands

Command	Action
!A	Shift above the division line.
!B	Shift below the division line.
!C	"Carriage return," begins a new line of text. Shift back to the starting position and down one line. This command also performs an implicit "!N" command, returning to the normal level and character size at the beginning of the new line.
!D	Shift down to the first level subscript and decrease the character size by a factor of 0.62.
!E	Shift up to the exponent level and decrease the character size by a factor of 0.44.
!I	Shift down to the index level and decrease the character size by a factor of 0.44.
!L	Shift down to the second level subscript. Decrease the character size by a factor of 0.62.
!N	Shift back to the normal level and original character size.
!R	Restore position. The current position is set from the top of the saved positions stack.
!S	Save position. The current position is saved on the top of the saved positions stack.
!U	Shift to upper subscript level. Decrease the character size by a factor of 0.62.
!X	Return to the entry font.
!Z(u0,u1,...,un)	Display one or more character glyphs according to their unicode value. Each ui within the parentheses will be interpreted as a 16-bit hexadecimal unicode value. If more than one unicode value is to be included, the values should be separated by commas. Note - If the specified unicode value does not exist in the current font, IDL will make a substitution and generate errors in the output log. For example, the Symbol font included with IDL is not a unicode font; specifying unicode values will generate errors.
!!	Display the ! symbol.