An alteration of ⋈, from ∞, an alteration of ↀ, an alteration of Ⓧ, from encircling X (the roman numeral for ten) to indicate the hundredth ten.
This symbol is the pre-combined Unicode glyph for the Roman numeral thousand, mainly intended for compatibility with large East-Asian character sets. It is used to represent the individual number where individual glyphs are not wanted. Otherwise, the Roman numeral one thousand is written as the sequence “M” .
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