It is a bit a tricky situation with EN 980.
Theoretically EN 980 is still the MDD and IVDD harmonized standard for medical device symbols.
Unfortunately the harmonization process stopped over one year ago and therefore no new list of harmonized standards has been published in the EU gazette since then.
EN ISO 15223-1 was designated to replace EN 980, but there were some "flaws", so it has not been harmonized (and therefore did not appear in the last published list of harmonized standards Gazette 2013/C 22/02 published 24.1.2013).
And it was some kind of "editorial mistake" that EN 980 disappeared from this list:
For every superseded standard, the new standard is bublished togehter with the date of cessation of presumption of conformity of the superseded standard.
Since this information has not been published for the EN 980 standard so far, it can not have been superseded by any other standard.
Unfortunately EN 980 was declared as withdrawn without harmonization of the sucessor...
But don't worry, just use EN 980 or EN ISO 15223-1, both will work fine.