hard to tell.
Oxalis ?

Here is a link that might be useful: google images - oxalis leaves

Could you do another picture - in focus and with a scale? Also the leaves are folded together. Can you spread one out?

Try looking at pictures of Trifolium, a plant that is called clover just as Oxalis is commonly called clover.

Trefoil leaves with those white chevrons are typical of Trifolium pratense but I can't see the terminal buds or even if the leaf really is trefoil. The OP says not. We really need a better picture.

Here is a link that might be useful: T pratense leaf

Hi, I hope these are better. Thanks
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Much better pictures, but I don't know what it is. Where is this plant located and is it in a garden or wild?

Amaranthus spinosus?

Here is a link that might be useful: {{gwi:272389}}

Agree that it is an immature pigweed, Amaranthus spp., can't see the spine of the spinosus, perhaps the pale leaf band is distinctive.