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.

When we tell a story that happened in the past should we use 'used to' and 'would' for actions that happened regularly in that story. For example in the following what differences do the five forms...

I always have some problems with changing an active sentence which contains used to into a passive sentence, for example: Mr Green used to teach languages at school. What is the passive form? I...

Aug 28, 2014 · Meaning of "by" when used with dates - inclusive or exclusive [duplicate] Ask Question Asked 11 years, 3 months ago Modified 11 years, 3 months ago

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 the …

Jul 9, 2017 · Are there any phrases like "Couldn't organise a piss-up in a brewery" or "Couldn't organise a root in a brothel" that are reasonably common, indicate organisational incompetence, have a …

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 didn't use to go …

Which one is the right sentence for a paper? We believe that our method can be an informed choice to use as starter program for... We believe that our method can be an informed choice to be used as

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 something …

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 about the …