It has been used as the symbol... is correct here. Use Present Perfect when the action referred to started in the past, and either continues (or continues to have relevance) at the time of speaking.

1 Used to describes an action or state of affairs that was done repeatedly or existed for a period in the past; to be used to (or to get used to) means "be or become familiar with someone or …

May 6, 2013 · As reported by the NOAD in a note about the usage of used: There is sometimes confusion over whether to use the form used to or use to, which has arisen largely because …

Jul 4, 2011 · Why does "used to" mean "accustomed to"? Why is "used to" used to indicate a recurring past event? In I used to be used to using it. there are three meanings of "use". I ask …

Jan 22, 2015 · Usage note: used to / be used to Do not confuse used to do something with be used to something. You use used to do something to talk about something that happened …

Does "to be used OF" mean "to be used FOR": wikipedia The English term "empiric" derives from the Greek word ἐμπειρία, which is cognate with and translates to the Latin experientia, from …

Jan 8, 2015 · What is the difference between "I used to" and "I'm used to" and when to use each of them? Here, I have read the following example: I used to do something: "I used to drink …

Jun 13, 2019 · What is the negative form of "I used to be"? I often hear "I didn't used to be" but that sounds awfully wrong in my ears.

Is it correct to say something like this? I used to use the knife to open things like cans.

To me, "used to" and "used for" are incompatible, as shown in the examples below. However, I am unable to substantiate this. MS Word doesn't "see" the differences, so I turned to …