Question about "this" sign

[Nikos Grammalidis]

Dear All,

We would like some help with the interpretation of "this" sign which is expressed by the following graphic according to the
PUDL dictionary:


Since the double stemmed arrows denote motion parallel to the wall plane, we cannot understand
the corresponding video from the ASL video dictionary

http://commtechlab.msu.edu/sites/aslweb/browser.htm

where the movement is parallel to the floor plane.
Can somebody explain this to us?

Thanks in advance,
Nikos Grammalidis.
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Nikos Grammalidis,
Electrical Engineer, Ph.D.
Informatics and Telematics Institute
1st Km Thermi-Panorama Road
57001 (PO Box 361)
Thermi-Thessaloniki, Greece
Tel. : +30-2310-464160, (internal 117)
Fax : +30-2310-464164
WWW : http://www.iti.gr/db.php/en/people/Nikolaos_Grammalidis.html
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