The compound shown is one stereoisomer of 4-methylhex-2-ene drawn with wedges at C4 and a definite geometry at the double bond. Its complete descriptor is

At the double bond, C2 carries $\mathrm{CH}{}_3$ over $\mathrm{H}$ and C3 carries C4 over $\mathrm{H}$; the drawing has these higher groups on opposite sides, so the bond is $(E)$. At C4 the priorities are $\mathrm{CH}=\mathrm{CH}{}^{-}$ (C attached to C,C,C with duplication) $>\mathrm{C}{}_2\mathrm{H}{}_5$ (C,H,H) $>\mathrm{CH}{}_3>\mathrm{H}$; with $\mathrm{H}$ away from the viewer the sequence runs clockwise, so C4 is $(R)$. The compound shown is $(2E,4R)$-4-methylhex-2-ene; it is one of $2\times 2=4$ stereoisomers.