The phrase "under signs" doesn't exactly have antonyms, as it is not a single word but rather a specific expression. However, some antonyms for the individual words may include "over," "above," or "on top of" for "under," and "symbols," "marks," or "indicators" for "signs." These antonyms can be useful when looking for alternative ways to express a similar concept, such as "above the symbols" instead of "under signs." When writing or speaking, it's important to consider different ways to convey ideas and use a variety of vocabulary to keep communication clear and engaging.