What's SENSU

It's...............

Sensu:Bingata(Tumugi) by Tinen Sekigen  
Sensu - Ougi - fan...
This is a textile called "Bingata", 
one of famous cloth in Okinawa by Mr. Tinen Sekigen
who uses Japanese fans as his motif here.
"SENSU" (or "Ougi") means a fan in Japanese.
Yes, SuperDARN FOV's below look like fans, don't they?!

Syowa East and South SuperDARN HF Radars' FOV is just "SENSU"
We call it "Syowa SENSU" radars...
Make sense?
Syowa East and South SuperDARN HF Radars' FOV

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SyowaSouth SENSU Radar
taken from MF radar site by M.Tsutsumi on Mar. 18, 1999
SyowaSouth SENSU Radar photo