Try to look it up via symbol search, by typing a few letters:
Or by searching in one of the available lists, that include all the symbols supported.
Stocks list (https://api.twelvedata.com/stocks).
Forex list (https://api.twelvedata.com/forex_pairs).
Cryptocurrencies list (https://api.twelvedata.com/cryptocurrencies).
ETFs list (https://api.twelvedata.com/etf).
Indices list (https://api.twelvedata.com/indices).
Eventually, if a particular instrument can not be found in the API in any of the lists, you may request it to be added via chat or email support.