線種 is read as せんしゅ (senshu) and means linetype.
せんしゅ
senshu
へんせんしゅ
edgetype
かいせんしゅべつ
line type
せん
division
せんろ
railway track
せんこう
incense stick
せんりょう
dose (of radioactivity)
せんが
line drawing
せんけい
linear
せんしんこうほうこう
line progression
せんどうき
line synchronization
せんぶん
line segment
せんじょう
on a line