Other characters

International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

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International Tables for Crystallography (2006). Vol. G. ch. 2.2, p. 36

Section 2.2.7.4.16. Other characters

S. R. Hall,^a ^* N. Spadaccini,^c I. D. Brown,^d H. J. Bernstein,^e J. D. Westbrook^b and B. McMahon^f

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(33) Other special alphabetic characters should be indicated as follows:

`\%a`	a-ring (å)	`\?i`	dotless i (ı)	`\&s`	German `ss' (ß)
`\/o`	o-slash (ø)	`\/l`	Polish l (ł)	`\/d`	barred d (đ)

Capital letters may also be used in these codes, so an ångström symbol (Å) may be given as \%A.

(34) Superscripts and subscripts should be indicated by bracketing relevant characters with circumflex or tilde characters, thus:

superscripts	`Csp^3^`	for	Csp³
subscripts	`U~eq~`	for	U_eq

The closing symbol is essential to return to normal text.

(35) Some other codes are accepted by convention. These are:

`\%`	degree (°)	`\times`	×
`--`	dash	`+-`	$[\pm]$
`---`	single bond	`-+`	$[\mp]$
`\db`	double bond	`\square`	$[\square]$
`\tb`	triple bond	`\neq`	$[\neq]$
`\ddb`	delocalized double bond	`\rangle`
`\sim`	$[\sim]$	`\langle`
(Note: `~` is the code for subscript)		`\rightarrow`	$[\rightarrow]$
`\simeq`	$[\simeq]$	`\leftarrow`	$[\leftarrow]$
`\infty`	$[\infty]$

Note that \db, \tb and \ddb should always be followed by a space, e.g. C=C is denoted by C\db C.

International Tables for Crystallography (2006). Vol. G. ch. 2.2, p. 36