Asemic writing is a wordless open semantic form of writing. The word asemic means "having no specific semantic content", or "without the smallest unit of meaning". With the non-specificity of asemic writing there comes a vacuum of meaning, which is left for the reader to fill in and interpret. All of this is similar to the way one would deduce meaning from an abstract work of art. Where asemic writing distinguishes itself among traditions of abstract art is in the asemic author's use of gestural constraint, and the retention of physical characteristics of writing such as lines and symbols. Asemic writing is a hybrid art form that fuses text and image into a unity, and then sets it free to arbitrary subjective interpretations. It may be compared to free writing or writing for its own sake, instead of writing to produce verbal context. The open nature of asemic works allows for meaning to occur across linguistic understanding; an asemic text may be "read" in a similar fashion regardless of the reader's natural language. Multiple meanings for the same symbolism are another possibility for an asemic work, that is, asemic writing can be polysemantic or have zero meaning, infinite meanings, or its meaning can evolve over time. Asemic works leave for the reader to decide how to translate and explore an asemic text; in this sense, the reader becomes co-creator of the asemic work.

In 1997, visual poets Tim Gaze and Jim Leftwich first applied the word asemic to name their quasi-calligraphic writing gestures. They then began to distribute them to poetry magazines both online and in print. The authors explored sub-verbal and sub-letteral forms of writing, and textual asemia as a creative option and as an intentional practice. Since the late 1990s, asemic writing has blossomed into a worldwide literary/art movement. It has especially grown in the early part of the 21st century, though there is an acknowledgement of a long and complex history, which precedes the activities of the current asemic movement, especially with regards to abstract calligraphy, wordless writing, and verbal writing damaged beyond the point of legibility. Jim Leftwich has recently stated that an asemic condition of an asemic work is an impossible goal, and that it is not possible to create an art/literary work entirely without meaning. He has begun to use the term "pansemic" too. He also explained (in 2020): "The term 'pansemia' didn't replace the term 'asemia' in my thinking (nor did 'pansemic' replace 'asemic'); it merely assisted me in expanding my understanding of the theory and practice of asemic writing". Others such as author Travis Jeppesen have found the term asemic to be problematic because "it seems to infer writing with no meaning."