Old texts use this character for a dazzling, glorious brightness, now written 耀.
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燿 is an archaic variant not used independently in modern Chinese; the standard character is 耀 (to dazzle / glory, as in 闪耀 'to glitter', 荣耀 'glory'). It also has a rarer reading yì meaning 'bright', kept mostly in names.
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Archaic and literary only — old texts, names and variant-form notes; use 耀 today.