Definition: Feeling or showing pleasure or contentment; pleased; glad.
One-handed sign. ASL written by Jolanta Lapiak, 2015.
Or, two-handed sign. But, the one-handed sign is commonly used in general. The two-handed sign is used in some contexts of meaning. ASL written by Adrean Clark.
"Happy" by Pharrell William; video/performance "composed by Rosa Lee Timm and Azora Telford and produced by a team of Deaf campers and staff from Deaf Film Camp 2014 at Camp Mark Steven."