These symbols are different camera metering modes. Center-weighted metering Matrix metering/evaluative metering Spot metering Yeh camera me light analysis ke leay hota hai manual use me. Iski base pe exposure decide hota ha.
The first one is used to focus on center point (useful for portraits)
The second one is spot metering jo small objects pe focus karta hai or usi ke mutabiq exposure calculate hota hai (useful while focussing on small objects)
The last one is matrix metering jo normally camera me by default pe hota (landscape,portrait etc.) Yeh camera frame ko different zones me divide karta ha or light multiple zones se he phir calculate karta hai
