V-Speeds Abbreviations List [Aviation Rules of Thumb]

List of often used V-speeds:
V₁	takeoff decision speed
V₂	takeoff safety speed
V_a	design maneuvering speed
V_b	design speed for maximum gust intensity
V_c	design cruise speed
V_d	design dive speed
V_df	demonstration dive speed
V_f	design flap speed
V_fe	maximum flap-extended speed (top of white arc)
V_h	maximum speed in level flight with maximum continuous power
V_le	maximum landing-gear extended speed
V_lo	maximum landing-gear operating speed
V_lof	lift-off speed
V_mca	minimum control speed with critical engine out, out of ground effect (red radial line)
V_mcg	minimum control speed with critical engine out during takeoff run
V_mo	maximum operating speed
M_mo	maximum operating Mach number
V_mu	minimum unstick speed
V_ne	never-exceed speed
V_no	maximum cruise speed (top of green arc)
V_r	rotation speed
V_ref	reference speed for final approach, normally (1.3 x V_so)
V_s	stall speed
V_so	stall speed in landing configuration (bottom of white arc)
V_sse	minimum safe single-engine speed
V_x	best angle-of-climb speed
V_xse	best single-engine angle-of-climb speed
V_y	best rate-of-climb speed
V_yse	best single-engine rate-of-climb speed