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 …

Oct 27, 2015 · I am trying to find out if this question is correct. Did Wang Bo used to be awkward? Should I write "use to be" instead of "used to be," or is "used to be" correct in this sentence?

Feb 14, 2024 · I am trying to explain to an ESL student how to understand when to treat "some" as plural and when to treat it as singular. One clear rule is when "some" is the subject followed...

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 …

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 …

Jul 28, 2017 · If "used to" is a set idiomatic phrase (i.e. not a tense), then why would it change its form from "use to" to "used to" for the sentence as it does in the positive?

Aug 25, 2020 · Page 496 of Collins Cobuild English Usage reads Many people use used to instead of use to in questions. However, some people consider that this use is incorrect, Did …

Apr 18, 2017 · Here is a question that has been nagging me for a few years: Which is the right usage: "Didn't used to" or "didn't use to?" Examples: We lived on the coast for years but we …