Highballs are popular in Japan, where the term haibōru (ハイボール) is synonymous with a whisky and soda (rather than an umbrella term for assorted mixers). Shōchū is used to make chūhai (チューハイ); various mixers can be specified by suffixing with -hai (〜ハイ), as in oolong highball (ウーロンハイ, ūron-hai).
Etymology
The name may have come from early railroad signals with raised globes meaning "clear track ahead", i.e., "you're good to go".[1][2]