skeletal formula 

Synonym: bond-line formula
https://doi.org/10.1351/goldbook.08208
Two-dimensional representation of a molecular entity in which bonds are indicated as lines between vertices representing octet carbon atoms with attached hydrogens omitted and in which other atoms are represented by their chemical symbols.

Examples: Ethanol, cyclohexene, 4-pyridone

Source:
PAC, 2022, 94, 353. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)) on page 503 [Terms] [Paper]