BASF LNT (Lean NOx Trap) technology removes NOx from diesel engine exhaust.
[edit on Wikidata] Sounding or urethral sounding is the medical use of probes called sounds to increase the inner diameter of the urethra and to locate obstructions in it. Sounds are also used to stretch the urethra in order to receive genital piercing. Urethral sounding and urethral play are also used to refer to this practice in a sexual context. Urethral play can involve the introduction of either soft or rigid items into the meatus of the penis (as well as farther in).
Ultrasound, which is defined by sound frequencies beyond the upper limit of human hearing, has been used as pest control only over the past few decades, however. The ultrasonic devices are plugged into a homeâs electrical receptacle outlets which then purportedly emit high-frequency sounds that are disruptive to pests.