There are several terms used, depending on the size, number and where you live.
If there are lots of small ones (grapes, apples, oranges): if you are American, you would call them seeds and, if you are British, you would call small ones seeds and slightly bigger ones (especially citrus fruit) pips.
If there is just one large one (olives, cherries, peaches etc): if you are American, you would call it a pit and, if you are British, you would call it a stone.
You can use this NGRAM graph to experiment with British/American terms for different fruits. As the NGram graph shows, these are not hard and fast rules.
One notable exception is processed fruits like dates and olives. Olives are mainly grown, prepared and packed in non-English speaking countries. They supply to both US (141,000 tonnes per year) and UK (1,600 tonnes per year). It's easy to see from these figures why the suppliers choose to use the American term "Pitted Olives" on their packaging, even on products supplied to the UK. The import figures were obtained from here and here.
That is the tub drain overflow plate, though it's actually above the drain, not the faucet. (The opening in this plate leads to a tube that prevents the tub from overflowing by allowing water to run out even if the drain in the bottom of the tub is stopped.)
Best Answer
The round item you have indicated is a radio button
Radio button (Oxford Learner's Dictionaries)
The difference between checkboxes and radio buttons is that you can check more than one checkbox in a group of checkboxes, but select only one radio button in a group of radio buttons.
The name comes from old-fashioned radios and TVs with buttons (round or not) which could be tuned to different radio stations or TV channels. If one button was already pressed in, and you pressed a different one, the first button popped out, and the second one stayed pressed in.
Note: Although British English speakers are familiar with, and use, 'check', many call this symbol
✓a 'tick', so we may say we 'tick' or 'untick' 'tick boxes'. Interestingly, this UK illustration for an article about 'tickboxes' shows a sheet headed 'checklist':