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Question: strange output from dsolve, _B1.. What does it mean?

Question:strange output from dsolve, _B1.. What does it mean?

nm 8552 Maple 2020
dsolve differential-equations
July 11 2020
1

I solved this ODE and got a solution and wanted to compre it with Maple. This is initial value first oder ODE. So it should have no constants in it. But Maple's solution contains something I never seen before _B1~

I wonder what it means? And odetest did not verify Maple's solution. 

restart;
ode:=diff(y(x),x)-y(x)/x+csc(y(x)/x)=0;
sol:=dsolve([ode,y(1)=0]);
simplify(odetest(sol,ode));

odetest does not gives zero.

This is my solution

mysol:=y(x)=x*arccos(ln(x)+1);
odetest(mysol,ode)

   0

Any idea what _B1~ means? The ~ looks like it is an assumed variable? may be leaked from inside Maple.

Maple 2020.1 on windows 10

 
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