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It's really all just about the spiral though... I'm not even sure what the symbol is for to be honest but I've rarely seen it a few times and just happy to have a couple NOS finally.
Regards,
Bill
ZM1263 In line, side-viewing indication Incorporates a red filter Characters —, +, ~, * 10-5 170 140 2-5 Flying Lead '* This is a symbol shaped like a Catherine-wheel on type ZM1263 that may be used for special indications, e.g. fault condition.
The ZM1263 is a side - viewing tube that contains symbols for alternating (N), plus (+), mines (-) and a fourth symbol, consisting of a spiral of two and a quarter turns for `equipment failed' or anything else that has no con- ventional symbol.