(game of Go) Initialism of double digit kyu.

(telecommunications) Initialism of direct dial-in. / (pharmacology) Abbreviation of dideoxyinosine; also ddI.

(calculus) Initialism of delay differential equation. / (computing) Initialism of Dynamic Data Exchange. / (ethics) Initialism of doctrine of double effect.

Initialism of David Dunlap Observatory. / Initialism of Dollard-des-Ormeaux (municipality in the province of Quebec, Canada.)

(software) Initialism of dynamic drive overlay (a type of computer software; a form of driver)

plural of ddNTP

Abbreviation of dideoxynucleotide triphosphate.

(Internet security) Alternative spelling of DDOS

(databases) Initialism of Data Definition Language. / (Internet) Initialism of Direct Download Link (an Internet link to a file, for immediate download, instead of via file sharing)

Abbreviation of differential diagnosis.