Altered form of heraldic File:Cross Pattée (Pattee, Patty, Formée, Formy), with parallel straight lines near the center.  Well-known in continental European heraldry (and so called a cross pattee in Rudolf Koch's classic "Book of Signs", see File:Cross of the Knights Templar.svg for a variant form), but perhaps not a cross pattee in English terminology.
SVG version of File:Cross-Pattee-alternate.png
Converted from the following PostScript code:

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202.3 563 225 270 220 arcn
202.3 37 225 140 90 arcn
262 262 lineto
37 202.3 225 0 310 arcn
563 202.3 225 230 180 arcn
338 262 lineto
397.6 37 225 90 40 arcn
397.6 563 225 320 270 arcn
338 338 lineto
563 397.6 225 180 130 arcn
37 397.6 225 50 0 arcn
262 338 lineto
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PNG by AnonMoos, first vector conversion by Melian