旗

Left side 㫃 is the 'fluttering banner' radical — a 方 base with a 2-stroke pennant streaming from the top, picturing cloth flapping on a flagpole. It is the indexing element for the whole flag-family — 旗 (flag), 族 (clan-banner = lineage), 旅 (travel under banner). 方 below 㫃 is the conventional dictionary lookup key.

Right phonetic 其 supplies the sound — qí matches directly with no shift. 其 originally pictured a winnowing-basket and was later borrowed for the third-person possessive. Same 其 phonetic produces 期 (qī, period), 棋 (qí, chess), 旗 (qí, flag), 欺 (qī, deceive) — a fertile rhyme group anchored by the qí/qī sound.