2.1.504 Part 1 Section 17.16.5.61, SYMBOL
a. The standard says the \j switch interprets text in the field argument as the value of a SHIFT-JIS character.
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If the \j switch is used with characters 0x5C or 0x7E, Word does not display their SHIFT-JIS substitutions.
b. The standard places no restrictions on the Unicode characters which may be used with the \u switch in the SYMBOL field.
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Using the \u switch, Word will not display surrogate pairs or Unicode characters outside of Unicode plane 0 (Basic Multilingual Plane). If a character is specified outside of plane 0, the value will be truncated to one within plane 0.
c. The standard allows the SYMBOL field to be nested inside another field.
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In Word, if the SYMBOL field is nested inside another field, no result is displayed.