  We show that the $\imath$Hall algebra of the Jordan quiver is a polynomial
ring in infinitely many generators and obtain transition relations among
several generating sets. We establish a ring isomorphism from this $\imath$Hall
algebra to the ring of symmetric functions in two parameters $t, \theta$, which
maps the $\imath$Hall basis to a class of (modified) inhomogeneous
Hall-Littlewood ($\imath$HL) functions. The (modified) $\imath$HL functions
admit a formulation via raising and lowering operators. We formulate and prove
Pieri rules for (modified) $\imath$HL functions. The modified $\imath$HL
functions specialize at $\theta=0$ to the modified HL functions; they
specialize at $\theta=1$ to the deformed universal characters of type C, which
further specialize at $(t=0, \theta =1)$ to the universal characters of type C.
